Neumann - M 147 TUBE

Behind the capsule is a lamp, which makes impedance converter office. The next stage is an efficient output circuit without transformer, ensuring a clean background noise level extremely low. Note: This innovative combination of technology and lamp circuits most advanced transistors earned the neighbor model M 149 Tube a TEC Award in 1997.

The M 147 Tube can use micro extremely long cables without affecting the quality of the audio signal. Like all Neumann microphones lamp, the M 147 Tube comes with an elegant satin nickel finish.

The microphone is delivered in a high quality aluminum case, with full set of accessories: microphone cable, microphone holder for articulated foot, universal power supply. Our modern manufacturing methods allow to offer this complete set at a very attractive price.
Applications
The famous capsule, enhanced by the characteristics of the lamp, makes the M 147 Tube microphone well suited to singing. Moreover, it constitutes a superb extra microphone on all types of musical instruments. The self-noise level of its tube circuitry allows seamless integration in modern recording chains, analog or digital.
Acoustic characteristics
The M 147 Tube is used vertically, the sound arriving at the front side where the logo of the brand Neumann, trapezoidal. Its black color identifies tube microphones. The capsule is very similar to that used in the U 47 model, and its influence is decisive in the sound personality of the M 147 Tube. It has a linear frequency response down to the upper midrange, and a bump above 2 kHz, peaking at 3 dB. The grid is a smaller version of the Model U 47, and effectively protects the cartridge against plosives and wind noise.
Directivity
The M147 Tube has a cardioid approaching a super-thanks to the specific design of the capsule. In acute, the directivity becomes more pronounced. This behavior is very similar to the model that inspired this new tube microphone: U 47 and its successor, the U 47 fet.
Electrical Characteristics
In comparison with other microphones, the impedance converter used by the M 147 Tube is distinguished by its own extremely low noise level: 12 dB (A) / 24 dB CCIR.


Similar to the model M 149 Tube newest, the new M 147 Tube combines carefully selected lamp (triode) with modern circuitry design. This technique can make the most of the special transfer characteristics of the lamp, and pass the audio signal from the capsule to the microphone output without any coloration or unwanted parasitic effect.

The lamp amplifies the signal of the capsule about 10 dB, which avoids any possible influence of the subsequent electronics. M 147 Tube delivers a high output voltage, and can feed lengths of cable without signal degradation microphone.

The ideal operating conditions (intensity in the anode heating voltage ...) while the lamp throughout its life. A wire detector looks all voltage drops in the microphone cable, thereby to compensate the power level N 149 A. The rise in the lamp temperature is gradual, with a reverse limit of the intensity, which guarantees a long life.
Filter
The electronic circuit of the microphone M Tube 147 has a flat frequency response ranging from 20 Hz to well above 20 kHz. Only the attributes of the capsule determine the typical sound characteristics of the microphone.
Operational stability
The capsule and the entire electronic circuit are mounted on suspension to prevent structure-borne vibration. With its extended frequency response, the M 147 Tube can reproduce extremely low frequency signals without distortion.

Therefore, the microphone could be very sensitive to unwanted interference in the grave, whether from structure-borne transmissions or air flow. To prevent signal degradation, we offer as accessories, the elastic suspension EA 1 and the windscreen WS 87. For close miking a voice, we recommend using the anti-pop screen PS PS 15 or 20a.